Instead of working on behalf of the Queen, Zara has a career as an equestrian.
It is through her love of horses that she is most often seen with her mother and the two royal women have attended the races together in the past.
During these appearances, Bruce Durham, body language expert at BelievingBruce, commented on their relationship.
The expert revealed Princess Anne may look slightly uncomfortable during some trips together.
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“In one photo [below], we have discomfort showing from Princess Anne. She has her arms crossed, called ventral protecting,” Bruce told Express.co.uk.
“It may be that what she is carrying simply feels more comfortable to be carried like this.
“But when compared to the open unprotected nature of Zara exposing her torso area, called ventral fronting, Zara most definitely looks the more comfortable of the two.”
The expert suggested Anne’s protective body language could show she is not as comfortable as her daughter in the situation.
“The outing shows both subjects mirroring each other,” the expert added.
“You can tell from the rise of Zara’s cheek and the look that is clearly visible on Princess Anne that this is an engaging conversation for both.
“You also have a mirrored head tilt as well as their torsos almost turned to each other at an identical angle.
“This indicates extreme comfort and joy in being in each other’s company at that moment.”
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The royal line of succession – who outranks who?
The line of succession to the British throne dictates the order in which each member of the Royal Family would ascend to the throne.
It is also seen as a ranking of importance with the head of the line, the Queen, taking the place of ruler.
Older children come before younger children. Traditionally boys came before girls, but this law was changed on 26 March 2015 before the birth of Prince William’s first child.
Incredibly, Catholics are still excluded from the line of succession, as are children born outside of wedlock.
The royals, who usually stick to a strict protocol when appearing in public, often arrive at events in ascending order of importance, with the most important royal arriving last.
Prince Charles, 71, is currently first-in-line to the British throne, followed by Prince William, 38, his oldest son.
Then comes Prince William’s children, George, seven, Charlotte, five, and Louis, two, and they are followed by Prince Harry, 36. Prince Harry is succeeded by his son Archie Harrison, born in May 2019.